abc material A kind of automatic design of escalator chain is introduced,the design software of Solid Works is chosen.The standard three- dimensional model and drawings are designed,the standardization and design rules are established,then three- dimensional model and engineering drawings could be designed automatically by using the software of Dri
R-convexity in R-vector spaces
la rams crop top Abstract In this paper, for every relation R on a vector space V, we consider the R-vector space ( V , R ) $(V,R)$ and define the notions of R-convexity, R-convex hull, and R-extreme point in this space.Some examples are provided to compare them with the reference cases.The effects of some operations on R-convex sets are investigat